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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Graph Neural Networks for Voltage Stability Margins With Topology Flexibilities
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Investigation of Limitations in Passive Voltage Clamping-Based Solid-State DC Circuit Breakers
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Leveraging Additional Sensors for Phase Identification in Systems with Voltage Regulators.
Abstract not provided.
Topology Identification of Power Distribution Systems Using Time Series of Voltage Measurements.
Abstract not provided.
A Model Predictive Approach for Voltage Support in Microgrids using Energy Storage Systems.
Abstract not provided.
Identification of Noise Covariances for Voltage Dynamics Estimation in Microgrids.
Abstract not provided.
Optimization-Based Estimation of Microgrid Equivalent Parameters for Voltage and Frequency Dynamics.
Abstract not provided.
A High-Voltage High-Current Benchtop Test Stand for Solid-State Switch Testing at the SNS
Solid-state switches already replaced thyratrons in the SNS extraction kicker power supplies, offering improved efficiency and reliability. However, recent supply chain disruptions, combined with a self-firing issue, led us to explore alternative solutions. A vendor-developed MOS-Gated Thyristor switch was introduced but ultimately failed during testing. To investigate the failure and assess possible improvements, a benchtop test stand was constructed to evaluate the performance of a single stage board. This test stand features a Pulse Forming Network (PFN) that operates at 6 kV and 6 kA, with a repetition rate exceeding 60 Hz, simulating real operational conditions. By utilizing this setup, we seek to gain a better understanding of the failure mechanisms, refine the switch designs, and ultimately develop a more reliable alternative for the extraction kicker power supplies.
Voltage-Current Behavior of a Superconducting STAR ® Wire in a 6-Around-1 Cable Configuration
A 6-around-1 transposed cable using superconducting STAR® wires can be useful for future circular collider applications. We made three cable samples using single STAR® wires with a diameter of 1.3 mm. The first two samples, made with a cabling machine, used STAR® wires consisting of a 0.7 mm diameter Nb-Ti core. The third cable sample was manually wound and used a STAR® wire made with a 0.81 mm diameter Cu core. The first sample showed severe degradation after the cable was bent to a 75 mm radius. The current-carrying capability of the innermost and outermost REBCO tapes in the STAR® wire degraded by 42% to 98% and the middle REBCO tapes remained intact. This was also the case for the second and straight cable sample. After fabrication of the third cable sample, we observed only about 5% reduction in the current along the wire, measured at different locations inside the terminations. Finally, the results indicate that the differences in architecture or fabrication of the STAR® wires could have caused differences in critical current retention after cabling.
Design and Validation of a MVDC Isolated Active Voltage Injection Based HCB
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Capacitive Power Transfer With Series-Parallel Compensation for Step-Up Voltage Output
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Output Power Regulation of a Series-Series Inductive Power Transfer System Based on Hybrid Voltage and Frequency Tuning Method for Electric Vehicle Charging
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